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package bug
import (
"encoding/json"
"fmt"
"reflect"
"github.com/MichaelMure/git-bug/repository"
"github.com/MichaelMure/git-bug/util/git"
"github.com/pkg/errors"
)
const formatVersion = 1
// OperationPack represent an ordered set of operation to apply
// to a Bug. These operations are stored in a single Git commit.
//
// These commits will be linked together in a linear chain of commits
// inside Git to form the complete ordered chain of operation to
// apply to get the final state of the Bug
type OperationPack struct {
Operations []Operation
// Private field so not serialized by gob
commitHash git.Hash
}
// hold the different operation type to instantiate to parse JSON
var operations map[OperationType]reflect.Type
// Register will register a new type of Operation to be able to parse the corresponding JSON
func Register(t OperationType, op interface{}) {
if operations == nil {
operations = make(map[OperationType]reflect.Type)
}
operations[t] = reflect.TypeOf(op)
}
func (opp *OperationPack) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Version uint `json:"version"`
Operations []Operation `json:"ops"`
}{
Version: formatVersion,
Operations: opp.Operations,
})
}
func (opp *OperationPack) UnmarshalJSON(data []byte) error {
aux := struct {
Version uint `json:"version"`
Operations []json.RawMessage `json:"ops"`
}{}
if err := json.Unmarshal(data, &aux); err != nil {
return err
}
if aux.Version != formatVersion {
return fmt.Errorf("unknown format version %v", aux.Version)
}
for _, raw := range aux.Operations {
var t struct {
OperationType OperationType `json:"type"`
}
if err := json.Unmarshal(raw, &t); err != nil {
return err
}
opType, ok := operations[t.OperationType]
if !ok {
return fmt.Errorf("unknown operation type %v", t.OperationType)
}
op := reflect.New(opType).Interface()
if err := json.Unmarshal(raw, op); err != nil {
return err
}
deref := reflect.ValueOf(op).Elem().Interface()
opp.Operations = append(opp.Operations, deref.(Operation))
}
return nil
}
// Append a new operation to the pack
func (opp *OperationPack) Append(op Operation) {
opp.Operations = append(opp.Operations, op)
}
// IsEmpty tell if the OperationPack is empty
func (opp *OperationPack) IsEmpty() bool {
return len(opp.Operations) == 0
}
// IsValid tell if the OperationPack is considered valid
func (opp *OperationPack) Validate() error {
if opp.IsEmpty() {
return fmt.Errorf("empty")
}
for _, op := range opp.Operations {
if err := op.Validate(); err != nil {
return errors.Wrap(err, "op")
}
}
return nil
}
// Write will serialize and store the OperationPack as a git blob and return
// its hash
func (opp *OperationPack) Write(repo repository.Repo) (git.Hash, error) {
data, err := json.Marshal(opp)
if err != nil {
return "", err
}
hash, err := repo.StoreData(data)
if err != nil {
return "", err
}
return hash, nil
}
// Make a deep copy
func (opp *OperationPack) Clone() OperationPack {
clone := OperationPack{
Operations: make([]Operation, len(opp.Operations)),
commitHash: opp.commitHash,
}
for i, op := range opp.Operations {
clone.Operations[i] = op
}
return clone
}
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